So simple to use and ultimately so flexible. I used to have about 40 rules in Mailsmith and then when this came out I ended up switching back to Mail.

Now in Mail, bar a few subscription emails, everything goes into the Inbox and the are then processed using this. The ability to decide email per email means that not only are my emails sorted and organised, they are actually dealt with as well.

If you're a GTD'er, it's essential and a great tool in getting the Inbox to empty.